Evidence of three-dimensional Ising ferromagnetism in the A-site-ordered perovskite CaCu3Ge4O12

Article

关键词: MAGNETIC-STRUCTURE;    CURIE-POINT;    DIPOLAR;    HEAT;    BEHAVIOR;    NICKEL;    LITBF4;    IRON;   

DOI  :  10.1103/PhysRevB.83.212403

来源: SCIE

【 摘 要 】

The A-site-ordered perovskite CaCu3Ge4O12 synthesized under high pressure undergoes ferromagnetic spin ordering below T-c approximate to 12 K. The critical exponents have been determined from isotherms of magnetization across T-c via an iteration process and the Kouvel-Fishermethod as well as from specific heat. Based on fitting parameters of T-c, beta, and gamma, the magnetization data in the vicinity of T-c can be scaled onto two universal curves in the plot of M/|epsilon|(beta) vs H/|epsilon|(beta+gamma), where epsilon = T/T-c- 1. Critical exponents alpha, beta, and gamma obtained indicate that CaCu3Ge4O12 is a three-dimensional coupled Ising ferromagnet with a small coercivity.

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